Here you can find some information about how to work with files when using an SVN
Now the installation is completed and so you need to import files from a remote SVN host. Go to File>> Import. There select SVN >>Checkout projects from SVN.
And select create a new repository location. There you can add the svn url. ( In assembla you can find this URL in Source/SVN page). After that it will show the file structure in the remote host. Select the folder to be checked out from the SVN.
After pressing next you’ll get a window for a New Project which you are already familiar. So you can create a new project in workspace or at an existing location. If you are developing a component for a web application like Joomla you can select exact folder for that component in a local Joomla installation. OK now you are ready to go. Files will be downloaded from the server and you can continue on editing those files. Once edited you can submit the file to the server by right clicking on a file in the Explorer in the left (For me it’s the PHP explorer).
Here when you go to Team you’ll see several items. If you use Commit your file will be uploaded overwriting the file in the server(be careful 🙂 ). Merge will merge your file with the one in the server. (Assembla will mail all team members about the changes in the files). So find out what those commands mean and use them according to the need. So now you are ready to work with your team :).